Gemstone Brittleness And Cleavage

These are Macy’s commercial-grade gemstones - amethyst, garnet, fancy colored sapphires, citrine, ruby, and emerald.

Earrings, necklaces, and bracelets take fewer knocks, but if you splurge on a ring, for durability, you might want to consider a gemstone's brittleness and cleavage, along with its hardness.

Princess Grace's ring

Hardness refers to a gemstone's rating from 1 (softest) to 10 (hardest) on Mohs' Hardness Scale, which reflects its resistance to surface scratching. While a diamond rates a 10 for hardness, it's actually a brittle gemstone that, upon impact, will crack more easily than other gemstones.

Queen Camila's ring

Cleavage is the gemstone's grain. Just like with beef or wood, a crystalline structure (meaning its atomic arrangement) is internally symmetrical. Cleavage refers to natural, predictable planes of weakness within a gemstone's structure where its atomic bonds are frail. These are the areas where a crystal is more likely to shatter.

Wallis Simpson's ring

Brittleness describes how easily a stone breaks or chips if struck. All faceted gemstones are considered brittle, yet how brittle they are depends on their cleavage. A gemstone's cleavage is a major factor in its brittleness and significantly lowers its toughness.

Queen Marguritta II's ring

So what is toughness? If a stone has excellent cleavage (like a diamond or topaz), hitting it at the exact right angle along that plane can cause it to split cleanly in two. Toughness describes a gemstone's resistance to breaking, chipping, or cracking when a heavy blow is applied. As it happens, diamonds have perfect cleavage planes in 4 directions, giving them relatively poor toughness. Despite being the hardest stone on Earth, a perfectly placed hit can cause diamonds to split along their planes (i.e., grains) just like a piece of wood.

Queen Victoria's ring

A cutter of gemstones uses this knowledge to determine how to cut a gemstone. Customers can use it to buy safer and more durable gemstones for everyday wear.

Some gemstones, such as sapphires and rubies, have no cleavage. Their tightly packed atomic structures resist breaking, making them far less brittle and giving them much higher toughness over diamonds to wear as daily rings.

Emeralds have imperfect cleavage in one direction (basal cleavage). Their cleavage and natural internal inclusions (jardins) make them brittle and prone to chipping.

Josephine Beauharnais' ring

Tough Gemstones For Daily Rings are:

Corundum (ruby and sapphire), spinel, alexandrite, moissanites, quartz (amethyst, citrine, agate, jasper), jade (both types), garnets, and turquoise.

High Risk Gemstones for Daily Rings include:

Emerald, topaz, tanzanite, moonstone, sunstone, labradorite, kuzite, and diamond.

Queen Maxima’s ring

Still, if you love the higher-risk gemstones and yearn to wear them as everyday rings, you can do so by selecting protective bezel or halo settings; remove them when you work or wash your hands; and (less desirable) only wear them for special occasions. In other words, be mindful and prepared to baby them. 

jardins in an emerald 

Frankly, I think we should never work or wash our hands with soap without removing all our gemstone rings. I keep a ring holder by the kitchen sink and take off my rings whenever cleaning. Jewelry is never cheap, so why take unnecessary risks? You always want to keep gemstones pristine and sparkling! 

 Queen Alexandra (Alix of Denmark), Queen Letizia of Spain, Diana & Catherine of Wales rings

Famous royal engagement rings are featured throughout today's blog, but no one needs to be engaged to wear a ring!

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Gemstone Hardness Versus Toughness